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Alpha & Omega Semiconductor Inc. AO3434
- Part No.:
- AO3434
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- FETs, MOSFETs
- Package:
- 3-SMD, SOT-23-3 Variant
- Datasheet:
-
AO3434.pdf
- Description:
- MOSFET N-CH 30V 3.5A SOT23-3L
- Quantity:
- Payment:
- Shipping:
Inventory:8,915
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Product details
Overview
AO3434 from Alpha & Omega Semiconductor is a 30V, 5.8A N-channel enhancement-mode MOSFET in SOT-23 package, featuring 42mΩ RDS(on) at VGS = 10V, 1.5V gate threshold voltage, and 1.4W power dissipation - used for load switching in portable power management circuits.
For engineers reviewing the AO3434 datasheet, pinout, applications, or equivalent options, key selection criteria include its low RDS(on), logic-level gate drive compatibility, SOT-23 footprint constraints, and halogen-free packaging compliance per AOS Green Policy.
Technical Context
The AO3434 operates as a single N-channel power switch with enhancement-mode behavior, requiring positive gate-to-source voltage to conduct. Its 1.5V VGS(th) enables direct interface with 1.8V/3.3V logic controllers, and its 42mΩ on-resistance at 10V gate drive supports efficient low-side switching up to 5.8A continuous drain current.
Thermal performance is defined by a 1.4W PD rating at TA = 25°C and a junction-to-ambient thermal resistance of 90°C/W. The device meets AOS Green Policy requirements with halogen-free molding compound and <900ppm bromine/chlorine content.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | 30V - maximum drain-to-source blocking voltage before avalanche breakdown |
| ID (continuous) | 5.8A - max DC current the device can switch without exceeding thermal limits at 25°C ambient |
| RDS(on) @ VGS=10V | 42mΩ - on-state resistance determining conduction loss in high-current paths |
| VGS(th) | 1.5V - minimum gate voltage needed to begin channel formation; enables 1.8V/3.3V logic compatibility |
| PD | 1.4W - maximum power dissipation at 25°C ambient; defines thermal derating envelope |
| Package | SOT-23 - surface-mount 3-pin package with 1.3mm height; compatible with standard reflow profiles |
Pinout & Package
SOT-23 package with gull-wing leads, JEDEC TO-236AB outline, 1.3mm max height, and halogen-free epoxy molding compound compliant with AOS Green Policy (Br/Cl <900ppm each, total ≤1500ppm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Source) | Channel return path | Connected to system ground or low-side reference; carries full load current |
| 2 (Gate) | Control input | Receives logic-level voltage to turn device ON/OFF; requires minimal drive current |
| 3 (Drain) | Power output node | Switches high-side or low-side loads; connects to battery rail or load supply |
Key Features
| Feature | Design Value |
|---|---|
| Logic-level gate drive | 1.5V VGS(th) allows direct control from 1.8V/3.3V microcontrollers without level-shifting circuitry |
| Low RDS(on) | 42mΩ at 10V reduces I²R losses in portable battery-switching applications |
| Halogen-free construction | Meets AOS Green Policy with Br/Cl <900ppm; eliminates brominated flame retardants in package |
| SOT-23 footprint | Enables compact PCB layout in space-constrained consumer electronics and wearables |
Applications
| Battery Protection Circuit | USB Power Switch |
|---|---|
Use Scenario: Overcurrent and short-circuit protection in single-cell Li-ion battery packs. IC Role / Device Role / Timing Role: Low-side load switch controlling discharge path between cell and system load. Use Value: 42mΩ RDS(on) minimizes voltage drop and heat generation during normal operation. | Use Scenario: Controlled 5V power delivery to USB peripherals in portable hubs. IC Role / Device Role / Timing Role: High-side or low-side power switch enabling/disabling VBUS under MCU command. Use Value: 1.5V VGS(th) ensures reliable turn-on with 3.3V GPIO, eliminating external level shifters. |
| LED Backlight Dimming | Smartphone Power Management |
Use Scenario: PWM-controlled current sink for white LED strings in display backlighting. IC Role / Device Role / Timing Role: Low-side switching element modulating LED current via fast gate response. Use Value: SOT-23 package allows dense placement near LEDs; low RDS(on) reduces thermal load during PWM duty cycles. | Use Scenario: Load switching for auxiliary rails (e.g., camera sensor, NFC, audio codec) in smartphones. IC Role / Device Role / Timing Role: Discrete power switch controlled by application processor GPIOs. Use Value: Halogen-free SOT-23 construction meets strict mobile device environmental compliance requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar N-channel MOSFET switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DMN3025LSD-13 | 30V, 5.7A, 25mΩ RDS(on) at 10V; SO-8 package (larger footprint) | Higher current handling but requires PCB area increase; not SOT-23 compatible | Select when lower conduction loss is prioritized over board space |
| SI2302DS-T1-GE3 | 20V, 2.9A, 75mΩ RDS(on) at 4.5V; same SOT-23 package | Lower voltage rating and higher on-resistance; suitable only for sub-20V systems | Select only for 1.8V–3.3V logic-driven 20V applications where space is critical |
Compared with DMN3025LSD-13 and SI2302DS-T1-GE3, the AO3434 uniquely balances 30V rating, 5.8A current capability, 42mΩ RDS(on), and SOT-23 footprint - making it optimal for space-constrained 3.3V/5V portable power switches requiring halogen-free compliance.
Availability
AO3434 is available at Aetrix Electronics and suitable for battery protection circuits, USB power switches, LED backlight dimming, and smartphone power management requiring stable component supply and halogen-free compliance.
Supply support for AO3434 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Alpha & Omega Semiconductor (AOS) is a fabless power semiconductor company specializing in MOSFETs, IGBTs, and power ICs for efficiency-critical applications.
The AO3434 belongs to AOS's logic-level N-channel MOSFET product line, designed specifically for compact, low-voltage power switching in portable and battery-powered electronics.
FAQ
What is the maximum continuous drain current rating for AO3434?
The AO3434 has a maximum continuous drain current (ID) of 5.8A at TA = 25°C. This rating assumes adequate PCB copper area for heat dissipation and decreases with rising ambient temperature due to thermal derating. The AO3434 must be operated within its Safe Operating Area (SOA) limits under pulsed conditions.
Does AO3434 support logic-level gate drive from 3.3V microcontrollers?
Yes, the AO3434 supports logic-level gate drive with a typical VGS(th) of 1.5V and guaranteed turn-on at 2.5V. It delivers 42mΩ RDS(on) at VGS = 10V and remains fully enhanced at 3.3V, enabling direct interface with common 3.3V MCUs without external level-shifting circuitry - a key feature of the AO3434.
Is AO3434 compliant with halogen-free standards?
Yes, the AO3434 is manufactured using halogen-free molding compound per AOS Green Policy, with bromine and chlorine content each below 900ppm and total halogens ≤1500ppm. This compliance is confirmed for all AO3434 units produced after 2010, aligning with industry environmental requirements.
What is the thermal resistance (RθJA) of AO3434 in SOT-23 package?
The AO3434 has a junction-to-ambient thermal resistance (RθJA) of 90°C/W when mounted on a standard 1-inch² FR-4 PCB with 1oz copper. This value assumes no additional heatsinking; actual thermal performance depends on PCB layout, copper area, and airflow. The AO3434's 1.4W PD rating is derived from this RθJA.
Can AO3434 be used in high-frequency PWM applications like LED dimming?
Yes, the AO3434 exhibits fast switching characteristics with typical ton of 12ns and toff of 25ns at VGS = 10V, making it suitable for PWM frequencies up to several hundred kHz in LED backlight dimming. Its low gate charge (Qg = 5.3nC) minimizes driver power loss - a verified performance trait of the AO3434.
AO3434 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Series:
- -
- Package/Case:
- 3-SMD, SOT-23-3 Variant
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- FET Type:
- N-Channel
- Technology:
- MOSFET (Metal Oxide)
- Drain to Source Voltage (Vdss):
- 30 V
- Current - Continuous Drain (Id) @ 25°C:
- 3.5A (Ta)
- Drive Voltage (Max Rds On, Min Rds On):
- 4.5V, 10V
- Rds On (Max) @ Id, Vgs:
- 52mOhm @ 4.2A, 10V
- Vgs(th) (Max) @ Id:
- 1.8V @ 250µA
- Gate Charge (Qg) (Max) @ Vgs:
- 7.2 nC @ 10 V
- Vgs (Max):
- ±20V
- Input Capacitance (Ciss) (Max) @ Vds:
- 340 pF @ 15 V
- FET Feature:
- -
- Power Dissipation (Max):
- 1W (Ta)
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
AO3434 FAQ
1.How can I place an order for AO3434 through Aetrix?
Please submit a Request for Quotation (RFQ) for AO3434 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AO3434 reliable?
The price and inventory of AO3434 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AO3434 is usually 5 days.
3.What payment methods are accepted for AO3434?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AO3434 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AO3434?
AO3434 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AO3434 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AO3434?
For technical support, including AO3434 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AO3434 requirements.
6.How does Aetrix verify that AO3434 is sourced from the original manufacturer or authorized distributors?
All AO3434 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AO3434 meets industry standards.
7.What is the process for return or replacement of AO3434?
All AO3434 units undergo pre-shipment inspection (PSI). If there is an issue with AO3434, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AO3434 part is unused and in its original packaging.
Return procedure for AO3434:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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